- There is some concern that users will wipe their phones by accident and raise support tickets and/or engage in any other activity that causes additional work/cost for google.
- 1st party support might step on various governments toes by shipping this by default.
No other major vendor has this feature. It could create a bad experience if a customer triggers it by accident. The same thing could be accomplished by an application that guards secret data rather than putting this in the OS. There are plenty of reasons not to implement this.
Nearly all of the major tech companies are walking a fine line with respect to "warrant-proof" tech products in the eyes of the current administration of the US government.
Building a feature like this would be tempting fate given the current climate at the AG's office IMO.
How deep do you want menus to go? Do menus 10-15 levels deep really help the end user?